An experiment was conducted (1) to determine the effect of formaldehyde treatment on the protein digestibility, nitrogen retention and energy digestibility of birdproof grain sorghum, and (2) to evaluate the effect of treated grain, when used as a grain component in a growth diet, on the growth rate and ability of baconers to utilize feed. Formaldehyde treatment significantly (P <0,05 improved protein digestibility from 55,7 to 73,2%. Pigs fed treated grain excreted significantly (P<0,05) more urinary nitrogen, resulting in a small insignificant difference in N-retention, which suggests a low protein availability in treated grain. Energy digestibility was significantly (P<0,05) improved from 81,8 to 84,2%, while a highly significant improvement was observed in the DE content of the grain from 15,0 MJ/kg to 15,52 MJ. In the growth trial conducted with 18 Landrace x Large White crossbred gilts, no significant differences were obtained in the growth rate and feed utilization of pigs fed from 25 to 85 kg live mass.